App-wide configuration

You have the option to pre-configure any of the Crummy options in an
application-wide configuration. The options above are available to
configure, with the exception of :separator, as well as many others.

The biggest difference is that :separator is not an option. Instead,
you have format-specific configuration options: :html_separator,
:xml_separator, and :html_list_separator. :separator can still be
overridden in the view.